Method of separately obtainino potassium chlorid and borax from



- salts a solution NOAH WRINKLE AND WALTER ITED STATES PATENT A. KUHNERT,- OF SAN FRANCISCO, CALIFORNIA. METHOD OF SEPARATELY OBTAINING POTASSIUM CHLORID AND BORAX FROM CERTAIN DRY SALTS.

No Drawing.

California, have invented new and useful.

niprovements in Methods of Separately Qbtaining Potassium Chlorid and Borax from Certain Dry Salts, of which the following; is a specification.

The present invention ments in methods of obtaining potassium chlorid and borax from c rtain mixtures of dry salts which contain potassium chloricl, borax, and other salts.

In treating crude, or mixed salts consisting'of potassium chlorid, sodium bi-borate and other salts, We add to the mixture of of sodium hydrate for the purpose of converting the sodium bi-borate into sodium meta-borate soluble in the solution. The sodium meta-borate and excess of sodium hydrate solution is removed from the crystals by centrifuging or filtration and the crystals are then washed free of adhering borate and sodium hydrate solution with fresh water. This treatment effects removal of allthe sodium bi-borate from the potas sium chlorid crystals remaining insoluble Specification of Letters Patent.

relates to improve Patented Sept. 23, 1919.

Appiication filed May 22, 1919. Serial No. 299,042.

after removal therefrom of the borate and sodium hydrate solution.

The mother liquor is then treated with carbon dioxid, obtained from a lime kiln, or other suitable source. This treatment results in the conversion of the sodium metaborate to sodium bi-borate, insoluble in the solution, in accordance with the following formula The mother liquor is then removed from the borax.

lVe claim In a process of obtaining potassium chlorid and borax from mixed dry salts comprising potassium chlorid and bOraX, treatlng said salts with a solution of sodium hydrate to convert the borax to sodium metaborate soluble in the solution, removing the insoluble crystals from the solution, and treating the solution with carbon dioXid to convert the sodium meta-borate to sodium bi-borate insolu le in the mother liquor and removing the mother liquor from the sodium bi-borate.

NOAH WR-INKLE. WALTER A. KUHNERT. 

